SOLVED: Can't export mesh, please help!

Hello. I have Ubuntu 18.04 and am trying to export a model with rig to file so I can import to Blender. I tried to download mhx2 and put it in the plugins folder. Now NOTHING exports: not collada, not obj, not anything. Just bvh, the rig. So I was reading about numpy this, numpy that...and someone on this forum talked about all exporters now not working, have to switch over to bitbucket? (what is that?) So I go to bitbucket, see this "clone" thing and read about mercurial or something or other. I know nothing of this stuff. Git is totally confusing to me. I try to follow instructions and nothing works. Hey, I'm an ARTIST, not a programmer. I am used to pointing and clicking and downloading stuff and it working.